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Leetcode Problem 880. Decoded String at Index

880. Decoded String at Index

Leetcode Solutions

Work Backwards to Find the k-th Letter

  1. Initialize size to 0 to represent the length of the decoded string.
  2. Iterate through the encoded string s to calculate the total size.
    • If the character is a letter, increment size by 1.
    • If the character is a digit, multiply size by the digit.
  3. Iterate backwards through the string s.
    • If the character is a digit d, divide size by d and reduce k modulo size.
    • If the character is a letter:
      • If k modulo size is 0, return the current letter.
      • Otherwise, decrement size by 1.
  4. Continue until the k-th letter is found.
UML Thumbnail

Direct Decoding with Early Stopping

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